The Experts below are selected from a list of 18420 Experts worldwide ranked by ideXlab platform
Cheng Yong - One of the best experts on this subject based on the ideXlab platform.
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Effects of the oxide film on the Spot joining of aluminum alloy sheets: a comparative study between Resistance Spot welding and Resistance Spot clinching
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Yu Zhang, Jing Guo, Zhen Luo, He Shan, Chun Feng Zhao, Cheng YongAbstract:A novel Spot joining technique (i.e., Resistance Spot clinching) that has the features of Resistance Spot welding and mechanical clinching is introduced. This technique was compared with typical Resistance Spot welding to show the effect of the surface oxide layer on the joining quality of aluminum alloy 5052 sheets. The oxide film increases the contact Resistance at each interface and makes it unstable. In both Resistance Spot welding and Resistance Spot clinching, the critical current for expulsion is lowered by oxide on the workpiece surface. However, the surface oxide layer has less effect on the stability of joining quality in Resistance Spot clinching. That is because in Resistance Spot clinching process, the melting of the workpiece is mainly caused by the Joule heat of the contact Resistance between processing tape and aluminum alloy 5052 sheets (which is less affected by the surface oxide layer). Thus, the fluctuation of the contact Resistance in Resistance Spot clinching is lower than that of Resistance Spot welding.
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Joining aluminum alloy 5052 sheets via novel hybrid Resistance Spot clinching process
Materials & Design, 2017Co-Authors: Yu Zhang, Jing Guo, Zhen Luo, He Shan, Cheng YongAbstract:Abstract Aluminum alloy 5052 sheets (thickness: 1 mm) were joined using a novel method (Resistance Spot clinching) that combines mechanical clinching and Resistance Spot welding processes. A pair of molds combine with processing tapes were exerted in this process. The microstructure of the fusion zone under novel process presents more portion of equiaxed dendritic zone compared with that of the Resistance Spot welded joint, which is due to the different temperature gradient feature during solidification. The mechanical properties of the joints were evaluated via orthogonal trials of tensile shear tests performed on the joints. The results revealed that, even under lower heat input, the load-bearing capacity of the Resistance Spot clinching joints is superior to that of the traditional Resistance Spot welding joints. Digital image correlation was used to evaluate the distortion behavior of the weld joints during testing. Compared with the stiffness of traditional joints, the higher stiffness of the Resistance Spot clinching joint generated a higher tensile stress component in the periphery of the fusion zone during testing (which resulted in a higher peak load).
Yu Zhang - One of the best experts on this subject based on the ideXlab platform.
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Effects of local stiffness on the Spot joints mechanical properties: Comparative study between Resistance Spot welding and Resistance Spot clinching joints
Journal of Manufacturing Processes, 2019Co-Authors: Yu Zhang, Xu Zhang, Jing Guo, Sunusi Marwana Manladan, Zhen LuoAbstract:Abstract Different types of aluminum alloy 5052 (AA5052) Resistance Spot clinching joints with different local stiffness values were designed in this study. The values of the polar moment of inertia in the cross-section of the fusion zones were calculated. Digital image correlation (DIC) technique was used to study the local rotation and in-plane strain distribution during the lap-shear test of half-cut samples. The results show that the joint with higher local stiffness (polar moment of inertia) value experiences the lowest joining zone rotation during the lap-shear test. This leads to higher proportion of normal component of strain/stress at the periphery of the joining zone. According to Tresca or von Mises failure criterion, for a Spot joint, high proportion of normal stress at the load-bearing site enables the global joint to sustain high peak load during tensile test. This mechanism indicates that, compared with conventional Resistance Spot welding process, the Resistance Spot clinching technique can improve the mechanical properties of AA5052 joints by increasing the local stiffness.
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Effects of the oxide film on the Spot joining of aluminum alloy sheets: a comparative study between Resistance Spot welding and Resistance Spot clinching
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Yu Zhang, Jing Guo, Zhen Luo, He Shan, Chun Feng Zhao, Cheng YongAbstract:A novel Spot joining technique (i.e., Resistance Spot clinching) that has the features of Resistance Spot welding and mechanical clinching is introduced. This technique was compared with typical Resistance Spot welding to show the effect of the surface oxide layer on the joining quality of aluminum alloy 5052 sheets. The oxide film increases the contact Resistance at each interface and makes it unstable. In both Resistance Spot welding and Resistance Spot clinching, the critical current for expulsion is lowered by oxide on the workpiece surface. However, the surface oxide layer has less effect on the stability of joining quality in Resistance Spot clinching. That is because in Resistance Spot clinching process, the melting of the workpiece is mainly caused by the Joule heat of the contact Resistance between processing tape and aluminum alloy 5052 sheets (which is less affected by the surface oxide layer). Thus, the fluctuation of the contact Resistance in Resistance Spot clinching is lower than that of Resistance Spot welding.
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Joining aluminum alloy 5052 sheets via novel hybrid Resistance Spot clinching process
Materials & Design, 2017Co-Authors: Yu Zhang, Jing Guo, Zhen Luo, He Shan, Cheng YongAbstract:Abstract Aluminum alloy 5052 sheets (thickness: 1 mm) were joined using a novel method (Resistance Spot clinching) that combines mechanical clinching and Resistance Spot welding processes. A pair of molds combine with processing tapes were exerted in this process. The microstructure of the fusion zone under novel process presents more portion of equiaxed dendritic zone compared with that of the Resistance Spot welded joint, which is due to the different temperature gradient feature during solidification. The mechanical properties of the joints were evaluated via orthogonal trials of tensile shear tests performed on the joints. The results revealed that, even under lower heat input, the load-bearing capacity of the Resistance Spot clinching joints is superior to that of the traditional Resistance Spot welding joints. Digital image correlation was used to evaluate the distortion behavior of the weld joints during testing. Compared with the stiffness of traditional joints, the higher stiffness of the Resistance Spot clinching joint generated a higher tensile stress component in the periphery of the fusion zone during testing (which resulted in a higher peak load).
Csr Zhuzhou - One of the best experts on this subject based on the ideXlab platform.
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Design of Resistance Spot Weld Controller Based on DSP
Journal of Hunan University of Technology, 2013Co-Authors: Csr ZhuzhouAbstract:A Resistance Spot weld controller was developed based on SEED-DEC2407 control board. The functional modules of the control board and its software integrated development environment were introduced. The total program frame of Resistance Spot weld controller was designed according to the requirements of Resistance Spot weld process, and the programming and debugging were performed respectively for the modules of UART, the timer, D/A and I/O. Finally, the total program of the controller was debugged and tested, and the results show that the developed Resistance Spot weld controller is practical.
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Design of Resistance Spot Weld Controller Based on DSP
Journal of Hunan University of Technology, 2013Co-Authors: Csr ZhuzhouAbstract:A Resistance Spot weld controller was developed based on SEED-DEC2407 control board. The functional modules of the control board and its software integrated development environment were introduced. The total program frame of Resistance Spot weld controller was designed according to the requirements of Resistance Spot weld process, and the programming and debugging were performed respectively for the modules of UART, the timer, D/A and I/O. Finally, the total program of the controller was debugged and tested, and the results show that the developed Resistance Spot weld controller is practical.
Zhen Luo - One of the best experts on this subject based on the ideXlab platform.
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Effects of local stiffness on the Spot joints mechanical properties: Comparative study between Resistance Spot welding and Resistance Spot clinching joints
Journal of Manufacturing Processes, 2019Co-Authors: Yu Zhang, Xu Zhang, Jing Guo, Sunusi Marwana Manladan, Zhen LuoAbstract:Abstract Different types of aluminum alloy 5052 (AA5052) Resistance Spot clinching joints with different local stiffness values were designed in this study. The values of the polar moment of inertia in the cross-section of the fusion zones were calculated. Digital image correlation (DIC) technique was used to study the local rotation and in-plane strain distribution during the lap-shear test of half-cut samples. The results show that the joint with higher local stiffness (polar moment of inertia) value experiences the lowest joining zone rotation during the lap-shear test. This leads to higher proportion of normal component of strain/stress at the periphery of the joining zone. According to Tresca or von Mises failure criterion, for a Spot joint, high proportion of normal stress at the load-bearing site enables the global joint to sustain high peak load during tensile test. This mechanism indicates that, compared with conventional Resistance Spot welding process, the Resistance Spot clinching technique can improve the mechanical properties of AA5052 joints by increasing the local stiffness.
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Effects of the oxide film on the Spot joining of aluminum alloy sheets: a comparative study between Resistance Spot welding and Resistance Spot clinching
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Yu Zhang, Jing Guo, Zhen Luo, He Shan, Chun Feng Zhao, Cheng YongAbstract:A novel Spot joining technique (i.e., Resistance Spot clinching) that has the features of Resistance Spot welding and mechanical clinching is introduced. This technique was compared with typical Resistance Spot welding to show the effect of the surface oxide layer on the joining quality of aluminum alloy 5052 sheets. The oxide film increases the contact Resistance at each interface and makes it unstable. In both Resistance Spot welding and Resistance Spot clinching, the critical current for expulsion is lowered by oxide on the workpiece surface. However, the surface oxide layer has less effect on the stability of joining quality in Resistance Spot clinching. That is because in Resistance Spot clinching process, the melting of the workpiece is mainly caused by the Joule heat of the contact Resistance between processing tape and aluminum alloy 5052 sheets (which is less affected by the surface oxide layer). Thus, the fluctuation of the contact Resistance in Resistance Spot clinching is lower than that of Resistance Spot welding.
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Joining aluminum alloy 5052 sheets via novel hybrid Resistance Spot clinching process
Materials & Design, 2017Co-Authors: Yu Zhang, Jing Guo, Zhen Luo, He Shan, Cheng YongAbstract:Abstract Aluminum alloy 5052 sheets (thickness: 1 mm) were joined using a novel method (Resistance Spot clinching) that combines mechanical clinching and Resistance Spot welding processes. A pair of molds combine with processing tapes were exerted in this process. The microstructure of the fusion zone under novel process presents more portion of equiaxed dendritic zone compared with that of the Resistance Spot welded joint, which is due to the different temperature gradient feature during solidification. The mechanical properties of the joints were evaluated via orthogonal trials of tensile shear tests performed on the joints. The results revealed that, even under lower heat input, the load-bearing capacity of the Resistance Spot clinching joints is superior to that of the traditional Resistance Spot welding joints. Digital image correlation was used to evaluate the distortion behavior of the weld joints during testing. Compared with the stiffness of traditional joints, the higher stiffness of the Resistance Spot clinching joint generated a higher tensile stress component in the periphery of the fusion zone during testing (which resulted in a higher peak load).
S J Hu - One of the best experts on this subject based on the ideXlab platform.
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Control of Resistance Spot welding
Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999Co-Authors: John Shriver, Huei Peng, S J HuAbstract:This paper discusses recent progress in the development of a feedback controller for the Resistance Spot welding process. Two key elements of our control architecture are: operating condition detection and nugget growth estimation. In this paper the operating condition problem is addressed with respect to three well-defined operating conditions. We employ a principal component-based design for the operating condition detector. The nugget growth estimation problem is addressed by employing an affine input-output model and neural networks for local feedback.
